No Hoper said:
… only vacuum Module locked out still have centrifugal advance.
I’m therefore not sure that the way in which static timing is set and dynamic timing is measured on that engine has much application to a bog standard piston aero engine.
A bog standard piston aero engine has mechanically fixed timing. There is no centrifugal (or vacuum) advance. (Impulse couplings on magnetos are a centrifugally-disabled retarding mechanism, to assist starting only.)
That’s one of the reasons it’s good to know how to use the RPM, mixture and throttle controls (mainly RPM and mixture) to move the PPP within a fairly small but operationally important range after TDC, on piston aero engines.